Good morning, The reason MFA isn’t prompting when you log into Office 365 might be related to the integration of Single Sign-On (SSO). When SSO is enabled, it allows you to log in once using your Windows credentials and gain access to multiple systems (like Office 365) without needing to authenticate repeatedly. If SSO is configured to remember your device or session, it can bypass the MFA prompts since it assumes the login is already trusted. Additionally, Conditional Access Policies might be set up to skip MFA under certain conditions (e.g., trusted locations or devices). Please check with your IT or admin team to confirm if SSO is set to enforce MFA during initial authentication or provide me more detail on how you integrated SSO. Ensure that Conditional Access Policies and trusted device settings are configured appropriately to maintain security while using SSO. If you need further clarification or support, let me know!